Trouble upgrading from 1.5.1 to 1.5.5e

www.phuzzymotorsports.com
Currently 1.5.1 going to 1.5.5e. PHP 5.4.36

I copied my site to a different folder, and created a new database for testing the upgrade.
I upload all the new install files to the copied folder, and run the zc_install/index.php. It tells me there are multiple admin folders (admin and zcadmin), so I choose zcadmin, hit refresh, and then hit upgrade. It goes through the iterations and says successful. The site is fine afterwards, but when I got to the zcadmin/index.php, I get "www.phuzzymotorsports.com is currently unable to handle this request". So what went wrong?

I changed my php version to 5.5.38 and still get the same error. Currently stuck in maintenance mode and I can't get it out since I can't login to zcadmin.

Site loads fine for me and can access your 'zcadmin' dir. as well. Speaking of which, you now need to change dir. name 'zcadmin' to something else. You can do that with your FTP program and Zen Cart will find automatically.

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Originally Posted by Website Rob

Site loads fine for me and can access your 'zcadmin' dir. as well. Speaking of which, you now need to change dir. name 'zcadmin' to something else. You can do that with your FTP program and Zen Cart will find automatically.

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OK, that's because I reverted to old version. Try again.

Wow, I needed to use the new admin folder, which I renamed. Then I figured out I had to change the DB_PREFIX.

So far, so good.